GeForce 840M vs GeForce 940M

Intro

Compare all that to the GeForce 940M, which uses a 28 nm design. nVidia has set the core frequency at 1072 MHz. The DDR3 memory runs at a frequency of 1000 MHz on this specific card. It features 384 SPUs along with 24 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce 940M		1740 points
GeForce 840M		1600 points
	Difference: 140 (9%)

Power Usage and Theoretical Benchmarks

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so theoretically they should have the same performance. (explain)

Texel Rate

The GeForce 940M will be a small bit (about 4%) faster with regards to texture filtering than the GeForce 840M. (explain)

GeForce 940M		25728 Mtexels/sec
GeForce 840M		24696 Mtexels/sec
	Difference: 1032 (4%)

Pixel Rate

The GeForce 940M is just a bit (approximately 4%) more effective at full screen anti-aliasing than the GeForce 840M, and should be capable of handling higher screen resolutions while still performing well. (explain)

GeForce 940M		8576 Mpixels/sec
GeForce 840M		8232 Mpixels/sec
	Difference: 344 (4%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transferred over the external memory interface in one second. It's calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.